Dirac-Majorana neutrino type oscillation induced by a wave dark matter

Some properties of a neutrino may differ significantly depending on whether it is Dirac or Majorana type. The type is determined by the relative size of Dirac and Majorana masses, which may vary if they arise from an oscillating scalar dark matter. We show that the change can be significant enough to convert the neutrino type between Dirac and Majorana periodically while satisfying constraints on the dark matter. This neutrino type oscillation predicts periodic modulations in the event rates in various neutrino phenomena including the neutrinoless double beta decay. As the energy density and, thus, the oscillation amplitude of the dark matter evolves in the cosmic timescale, the neutrino masses change accordingly, which provides an interesting link between the present-time neutrino physics to the early universe cosmology including the leptogenesis.

Automated summary

The properties of a neutrino can vary significantly depending on whether it is Dirac or Majorana type, which is determined by the relative size of Dirac and Majorana masses. These masses can change if they come from oscillating scalar dark matter. The study shows that the change can be significant enough to convert the neutrino type periodically between Dirac and Majorana, while still satisfying constraints on the dark matter. This oscillation predicts periodic modulations in event rates in various neutrino phenomena.